WRA Calcined Alumina

Description: ALUMINA

Oxide	Analysis	Formula
CaO	0.02%	-
Na2O	0.10%	-
Al2O3	99.70%	1.00
SiO2	0.02%	-
Fe2O3	0.02%	-
LOI	0.10%	n/a
Oxide Weight		102.16
Formula Weight		102.27

Notes

This is an intermediate soda, medium crystalline 3rd generation calcined
alumina.
WRA A-17 A-16
Ultimate crystal size d50-Eppendorf, microns: 2.5-3.2 3.0-3.5 .3-.5
Al₂O₃ 99.5+ 99.5+
SiO₂ .02 for A17, .01 for A16
Fe₂O₃ .01 for all
Na₂O₃ .08 for A17 and A16
Specific surface area: BET, m2/g .5-.8 3 3-7
Aggregate size, % for WRA: >150 micron 1-10, >63 " 60-80, >40 70-95
Grinding time, Hrs: 4 for A17, 16 for A16
Green density, g/cc: 2.15 for A16, 2.5 for A17
Fired density, g/cc: 3.88 for A16, 3.75 for A17

From Aluminum Company of America
1501 Alcoa Building
Chemicals Division
Pittsburg, PA 15219

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Typecodes	Alumina Alumina products
Glossary	Calcination Calcining is simply firing a ceramic material to create a powder of new physical properties. Often it is done to kill the plasticity or burn away the hydrates, carbonates, sulfates of a clay or refractory material.

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